En
gl
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20
7.2.3 Analog
Applies to DDE-AR control variant.
In this operation mode, the pump doses according to
the external analog signal. The dosing volume is
proportional to the signal input value in mA. The
input signal must be 4-20 mA.
The maximum dosing volume can be changed via
the capacity adjusting knob.
Example:
7.2.4 Changing the operation mode
Applies to DDE-AR control variant.
1. Set adjusting knob to 0 %.
2. Connect power supply. See section
3. Hold down the [Operation mode] key until the
next operation mode is activated.
– The operation mode LED indicates the active
operation mode.
– Repeat until the desired operation mode is
active.
7.3 Inputs/outputs
Applies to DDE-AR control variant.
7.3.1 External stop
The pump can be stopped via an external
contact, e.g. from a control room.
When activating the external stop signal, the pump
switches to operating state "Standby". The active
operation mode LED flashes green and the red
external stop LED is on.
The contact type can be changed. See section
7.3.2 Empty and low-level signals
In order to monitor the filling level in the tank, a
dual-level sensor can be connected to the pump.
The pump responds to the signals as follows:
The contact type can be changed. See section
Set capacity
[%]
Input signal
[mA]
Dosing flow
[%]
100
≤
4.1
0
≥
19.8
100
50
≤
4.1
0
≥
19.8
50
1
≤
4.1
0
≥
19.8
1
Frequent disengagement from the mains
voltage, e.g. via a relay, can result in
damage to the pump electronics and
reduces the dosing accuracy.
We strongly recommend only to use the
external stop signal to start and stop the
pump.
Sensor signal
Pump status
Low level
• LED flashes
• Pump continues running
Empty
• LED on
• Pump stops dosing
CAUTION
Automatic startup
Minor or moderate personal injury
- When the tank is filled up again, the
pump restarts automatically.
